机会也许只敲一次门但试探却总是在按门铃。

Opportunity may knock only once but temptation leans on the doorbell.

youdao

机会只会敲一次门。

Opportunity may knock only once.

youdao

机会也许只敲一次门，但试探却总是在按门铃。

Opportunity may only knock once, but temptation is always at the door bell.

youdao

This is the first instance in which Richard will do what he later describes Mencken doing, using words as weapons.

如同门肯后来所做的,语言第一次被理查当作武器。

耶鲁公开课 - 1945年后的美国小说课程节选

When I first taught this class that was back in 2002, I taught it at a seminar and had eight students.

我第一次开设这门课程，是在2002年，是以讨论会的形式，只有8名学生。

哈佛公开课 - 幸福课课程节选

It's a huge price to pay in a pass-no-record first semester class . And, you know who is most severe on the committee on discipline?

这个代价太大了，只为了,第一次学期通过一门无记录的课程,你们知道着纪律委员会,谁最为严厉吗？

麻省理工公开课 - 固态化学导论课程节选